Portable spot welding gun



PORTABLE SPOT WELDING GUN Filed Oct. 26, 1946 2351 /3 /3 fi v 35 /0 E 6 r 2 l 9 f 7 ZC (9- 5 i /5 w I INVENTOR. yd b /7 /6 BY ATTOENE 5 3.

Patented Mar. 8, 1949 PORTABLE SPOT WELDING GUN Joseph J. Panik, Detroit, Mich, assignor to Banner Products Company, Milwaukee, Wis., a cor poration of Wisconsin Application October 26, 1946, Serial No. 705,945

12 Claims.

This invention relates to portable spot welding guns.

It is a general object of the present invention to provide a relatively inexpensive, portable spot welding gun for use in welding operations where the more cumbersome type of welding device is not suitable.

A further obfect of the invention is to provide a welding gun of the class described including yielding means, preferably in the form of a leaf spring, which is interposed between the actuating mechanism and one of the movable rods for maintaining a constant pressure at the welding points.

Another object of the invention is to provide a welding gun including toggle mechanism for causing relative movement between the rods to thereby move the welding tips toward or away from one another.

A further object of the invention is to provide a welding gun as above described. wherein there is a pivoted take up link connected to said toggle mechanism, together with means for varying the normal pivoted position of said take-up link. With this arrangement, the position of the toggle links may be altered to prevent the toggle from going past its center after wear has shortened the welding points.

A further object of the invention is to provide means responsive to movement of the actuating lever to operative position for automatically causing current to flow into the gun.

Other objects of the invention are to provide a welding gun which is relatively simple to manufacture and assemble, to provide a welding gun improvements in in which any part may be easily replaced, and to Fig. 2 is a sectional view taken along the line 2-2 of Fig. 1; and

Fig. 3 is a sectional View taken along the line 3-3 of Fig. 1.

Referring more particularly to the drawing, the numerals 5 and 6 designate pivot castings or rod holders which are pivoted together by means of the pin l. The upper rod holder 5 comprises a top section 8 and a forked lower section 9, the juxtaposed faces of said sections having complernentary semi-cylindrical bore portions l0 and l i for receiving a rod l2. The rod I2 is preferably formed of cold drawn copper, and the castings 5 and 6 are puferably formed of bronze.

The lower rod holder 6 has a bore It for receiving a lower rod E5, and the latter is formed of the same material as the rod it. The lower edge of the holder 5 is split as at H5, and a screw ll is adapted to adjustably and removably clamp the rod in position in the holder.

Supported in the outer ends of the rods [2 and ill, in any well known manner, are the usual welding points l8.

A handle member 19, which may be an aluminum casting, has a transverse bore near its upper end, through which the rod l5 extends. The upper end of the handle is split as at and bolts 22 are utilized to adjustably and detachably clamp the handle in. a selected position on the rod l5. An intermediate portion of the handle is hollow at 23 and. pivoted therein on a pin 24, is a take-up link 25. The inner end of the link is preferably of reduced thickness and is engaged by an adjustment screw 26. The outer end of the take-up link is pivotally connected as at 2? to one end of a link 28. The link 23 forms one of links the toggle actuating mechanism. The other link of the toggle actuating mechanism is formed by the upper portion 29 of a lever the said lever being pivotally connected as at (H to the link 28.

The portion 20 of the lever 39 is forked as at 32 to embrace the rods 22 and 15. The extreme upper end of the lever portion 2e has one end of a leaf spring pivctally connected thereto as at 34. The leaf spring extends parallel to and above the rod 62 and fits within a recess 35 in the top of the rod-holding member 5 where it is rigidly maintained in position b the bolts l3.

Concealed within the lower portion of the handle I9 is a switch box 36 having an actuating button 3'! which is adapted to be engaged by a portion of the handle 3? when the handle is depressed against the tension of a coil spring 33.

From the switch box 36 suitable wires may extend through an insulated cable 39 to a timer (not illustrated). The arrangement is such that when the switch 31 is closed, current is induced to flow through welding cables 40 and into the gun.

In us of the improved spot welding gun, the

accaocc into contact with the handle, the t nism, together with the interposed 33, will act to apply pressure on the v and cause them to be moved toge her. of the use of the novel leaf spring pressure will be applied. As the wel l3. l8 wear, the toggle mechanism will to. more and more toward a str, when the handle is squeezed. however, by providing the adjustable take-up link the toggle may be adjusted so as to prevent the t from pivoting past center during on It is obvious that the spot weld made light in weight and can be eas by one hand. Due to its relatively it may be used in many places b are ble welding devices are impractcal. so designed that any part can be replace-1i whenever required.

Although only one form. of the inven been shown and described, it is obvious the ous changes and modifications may be made without departing from spirit of ti tion, and all of such changes are cont n as may come within the scope of the c What I claim is:

1. In a welding gun, a pair of terminal rods having welding points, means for pivotally connecting said rods together whereby the points may he moved toward and away from each other, and actuating mechanism connected to rods for causing said pivotal movement, the connec tion between one of the rods and actua mechanism including an elongated leaf spring.

2. In a welding gun, pair of terminal is having welded points, means for L necting said rods together whereby may be moved toward and away from. a handle connected to one of said actuating mechanism pivotally connect. to said handle, and a leaf spring connecting said a tuating mechanism to the other of said terminal rods.

3. In a welding gun, a pair of term" having welding points, means for piv necting said rods together who" may be moved toward and away fro a handle connected to one of an adjustable take-up link gxiotany said handle, a toggle link pivotally connected a one end to said take-up link, a lever pivotally connected intermediate its length to the ct end of said toggle link, inea'" said lever to the other of said ter rods.

4. In a welding gun, a pair of ter .al rods having welding points, means for pivotally c" necting said rods together w ereby the po. may be moved toward and away from each otl er, a handle connected to one or said lltil rooc, a link pivotally connected at one end to said handle, a lever pivotally connected intermediate its length to the other end of said link. and a leaf spring connecting said lever to the on or of said terminal rods.

In a welding gun, a pair of terminal rods having welding points, means for pivota' necting said rods together w. ereby the maybe moved toward and away rroin each otl' a handle connected to one of said. terminal ro a take-up link pivotally connected to dle, a toggle link pivotally connected at one e to said take-up link, a lever pivotally connec, intermediate its length to the other end of toggle link, means connecting said lever to the other of said terminal rods, and an adjustment member for varying the pivoted position of s take-up link,

6. In a welding gun, a pair of terminal rods having welding points at one end thereof, means intermediate the length of said rods for pivotally connecting the same together whereby the points be moved toward and away from each other, and actuati mechanism on the opposite side of said pivotal connection from the points and resiliently connected to at least one of said rods for causing said pivotal movement, said actuating mechanism including a toggle joint.

Tl. a welding gun, a pair of terminal rods having welding points at one end thereof, a holding n er clamped to one of said terminal rods intermediate the length thereof, a holding member clamped to the other of said terminal rods intermediate the length thereof and pivoted to first holding member, a handle connected to one of said terminal rods, a toggle joint pivotally connected at one end to said handle, and a leaf spring connected at one of its ends to said toggle joint, the other end of said leaf spring being rigidly connected to the holding member for the other of d terminal rods, one of the links of said toggle joint having a lever extension which is positioned f r movement toward and away from handle to move the welding points toward and away from each other.

e. In a welding gun, a pair of terminal rods having welding points at one end thereof, means 1" "r ivotally connecting said rods together wheresy the points may be moved toward and away from each other, a handle connected to one of said terminal rods, a toggle joint pivotally connected at one end to said handle, resilient means connecting the other end of said toggle joint to the other of said terminal rods, said toggle joint having a lever extension which is movable toward and away from the handle, and a switch for controlling the flow of electricity to the welding points carried by the handle and positioned to be actuated by pressure of the lever extension.

9. In a welding gun, a pair of terminal rods havi g welding points, means for pivotally conneoting said rods together whereby the points may be moved toward and away from each other, handle connected to one of said terminal rods, a linlc pivotally connected at one end to said handle, a lever pivotally connected intermediate its length to the other end of said link, and a leaf spring connecting said lever to the other of said terminal rods, said leaf spring normally extending substantiall parallel to said other terminal rod.

10. In a welding device, a pair of terminal rods having welding points, means for pivotally connecting said. rods together whereby the points may be moved toward and away from each other, a supporting member by which one of said rods is car .06., an adjustable take-up link pivotally connected to said supporting member, and actuating mechanism pivotally connected to said take-up link and to the other of said terminal rods.

1 a welding device, a supporting member, a terminal rod carried by said supporting member and having a welding point, a second ter- Initial rod having a welding point and movably supported in operative relationship with respect to said first terminal rod, an adjustable take-up link pivotally connected to said supporting mem-- her, and actuating mechanism pivotally connected to said take-up link and to said second rod for causing movement of said rods toward one another.

12. In a welding gun, a pair of terminal rods having welding points, means for pivotally connecting said rods together whereby the points may be moved toward and away from each other, a handle connected to one of said terminal rods and having a recess therein, a take-up link pivotally mounted in said recess, an externally accessible adjustment screw threadedly mounted in said handle and extending into said recess into engagement with an end of said take-up link, a toggle link pivotally connected at one of its ends to the opposite end of said take-up link from that engaged by the adjustment screw, a lever pivotally connected intermediate its length to the other end of said toggle link, and means connecting said lever to the other of said terminal rods.

JOSEPH J. PANIK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES: PATENTS 

